Very pleased with this jersey, and it fits my dog well. For reference, my dog has a 12" neck, and 17" chest, and is about 13" in length, and I ordered a Medium. Thank you! >> sold through our family's etsy shop. review submitted Dec 18, 2021. Actual review for reference: https://www.etsy.com/shop/notspoiledatall/reviews/2265165483